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July 2002

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Wed, 3 Jul 2002 14:36:03 +0800
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Hi, David,

If +/-5 degrees is measurable, +/- 1 degree should be as well, only with
more sensitive equipment. I believe angles are or can be measured using
optical interferometry or X-ray. For optics, this requires a grid or
graticule of particular line pitch - the finer the tolerence to be
measured, the finer the pitch of graticule needed to produce visible
fringes. Since instrumentation using light wavelengths is commonly used to
measure things with differences within one wavelength of the light source,
a tolerence as coarse as 1 degree should be quite easy.

Sorry I can't suggest actual equipment to do this, and I've no idea about
costs. Product yield @ 1 degree tolerence will be down on same product @ 5
degrees tolerence, so unit costs will increase unless 1 degree tolerence is
within the capability of the process(es) concerned anyway. Just find
yourself a precision machineshop specialising in aerospace products and you
should have no real practical problems

Peter


David Hoover <[log in to unmask]> 03/07/2002 12:39 PM
Sent by: TechNet <[log in to unmask]>

Please respond to David Hoover

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: [TN] Angle Tolerances








I have a customer who has specified +/-1 degrees on angles in the
general tolerance portion of their part number title block on their
blueprint.  On other prints the typical tolerances found are +/5 degrees.
Is this +/-1 degrees something that's possible?
What on earth could measure something like that?

Is their a general specification that lists volume/production tolerances
including something like these angles?

I'm extremely curious,

David Hoover
Staff Application Engineer
Multek Technology, Inc.
www.multek.com

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